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    L94 leaks and oil pressure issue -Long-

    Back story Bought the truck 1-1-22 145,017 miles 5400 hrs no leaks no oil pressure issues IRRC it was around 30 at idle and over 40 on the highway. I do not remember how fast it built its full pressure. it was 74deg in Fort Worth when I bought the truck and by the time I drove it the 45 miles...
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    Plugs and plug wire pics...Are these factory?

    Are these factory wires? They say MSD on the boots. I doubt they are but figure I would ask. I think its time for new plugs and wires. Took it to the car wash and driving home had miss on #6 open the hood and there was water all over the engine bay. Guess I need to start replacing cowling...
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    Tech 2 MDI1 MDI2 CanDi what do i really need here?

    I have been reading threads for the last 2 hrs trying to make sure I get the right equipment. Here is what I think I know, feel free to correct me. I have to have something to read codes and it needs to be a tech 2 level machine at a minimum if i want to be efficient at repairing my own...
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    Fuel Pump Control and Trailer Brake control module combo WTF?

    Im sure no one here came up with this but why would the FPCM and the TBCM be combined. What does stopping a trailer have to do with pumping fuel?
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    Wiring diagram help 10 and 20 series references, what do they mean?

    So chasing a few issues on the Yukon and came across something on the Mitchell wiring diagram I don't understand. In the attached image the wiring diagram keeps referring to a 10 series and 20 series. I have circled them in red. Is this a connector series or a harness series? How do you know...
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    DIC and lower console button back lights not working

    So I have a new to me 2012 Yukon xl Denali with 145k on it. The DIC buttons to the right of the cluster and the Pedal adj / park asst / traction control buttons do not light up at night like all the other buttons in the truck. Has anyone ran into this? Are they supposed to light up? Shouldn't...

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